Class GribDataRepresentation

Namespace

EncDotNet.S100.Datasets.Grib

Assembly

EncDotNet.S100.Datasets.Grib.dll

The data representation section (Section 5) of a GRIB2 field: how its values are packed.

public sealed class GribDataRepresentation

Inheritance

object

GribDataRepresentation

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

Every supported template stores integers X that decode to Y = (R + X × 2^E) / 10^D, with ReferenceValue R, BinaryScaleFactor E and DecimalScaleFactor D. The templates differ in how the X are stored:

Template	Packing
5.0	Simple: each value in BitsPerValue bits.
5.2	Complex: values in groups, each with its own reference and bit width.
5.3	Complex, packing the first or second differences of the values.
5.40	A JPEG 2000 codestream whose samples are the values, lossless or lossy (CompressionType).
5.41	A PNG image whose pixels are the values, BitsPerValue bits deep.

Other templates are listed with their number, and the field's UnsupportedReason names them: for example 5.42 (CCSDS) and 5.4 (IEEE floating point).

Properties

BinaryScaleFactor

The binary scale factor E.

public int BinaryScaleFactor { get; }

Property Value

int

BitsPerValue

The bits per packed value (for complex packing, per group reference; for PNG, the image depth). 0 means every value is R.

public int BitsPerValue { get; }

Property Value

int

CompressionType

For template 5.40, the type of compression (code table 5.40): 0 lossless, 1 lossy; otherwise null. The decoder doesn't need it: the codestream says which wavelet transform it uses.

public int? CompressionType { get; }

Property Value

int?

DecimalScaleFactor

The decimal scale factor D.

public int DecimalScaleFactor { get; }

Property Value

int

MissingValueManagement

For templates 5.2 and 5.3, how missing values are embedded in the packed data; otherwise None.

public GribMissingValueManagement MissingValueManagement { get; }

Property Value

GribMissingValueManagement

NumberOfGroups

For templates 5.2 and 5.3, the number of groups; otherwise 0.

public long NumberOfGroups { get; }

Property Value

long

NumberOfPackedValues

The number of values packed in Section 7: the grid points less those the bitmap marks missing.

public long NumberOfPackedValues { get; }

Property Value

long

OriginalFieldType

The type of the original field values (code table 5.1): 0 floating point, 1 integer.

public byte OriginalFieldType { get; }

Property Value

byte

ReferenceValue

The reference value R.

public float ReferenceValue { get; }

Property Value

float

SpatialDifferencingOrder

For template 5.3, the order of spatial differencing (1 or 2); otherwise 0.

public int SpatialDifferencingOrder { get; }

Property Value

int

TargetCompressionRatio

For template 5.40 with lossy compression, the target compression ratio M in M:1 the encoder aimed for; otherwise, or when the template gives it as missing, null.

public int? TargetCompressionRatio { get; }

Property Value

int?

TemplateNumber

The data representation template number (code table 5.0).

public int TemplateNumber { get; }

Property Value

int